How to determine a point inside a polygon in Java?
Following piece of java code is a solution to determine whether a 2D Point is within a Polygon or not (taken from here ). I think this code has some problems. For example for this polygon: It returns true (inside) for (76,82) but this point is on the edge (Code returns false correctly for another point on the edge : (45,17)).
How is the polygon class in Java serializable?
Class Polygon. public class Polygon extends Object implements Shape, Serializable The Polygon class encapsulates a description of a closed, two-dimensional region within a coordinate space. This region is bounded by an arbitrary number of line segments, each of which is one side of the polygon.
What happens when you flush a polygon in Java?
Invalidates or flushes any internally-cached data that depends on the vertex coordinates of this Polygon .
How to draw a polygon in Java using jpanel?
JFrame does not have a paintComponent (Graphics g) method. Add the @Override annotation and you will get a compile time error. 1) Use JPanel and override paintComponent (you would than add JPanel to the JFrame viad JFrame#add (..))
When do you consider a polygon as a path?
If the polygon is convex then one can consider the polygon as a “path” from the first vertex. A point is on the interior of this polygons if it is always on the same side of all the line segments making up the path.
How to compute a polygon point in C #?
Compute (y – y0) (x1 – x0) – (x – x0) (y1 – y0) if it is less than 0 then P is to the right of the line segment, if greater than 0 it is to the left, if equal to 0 then it lies on the line segment. Here is its code in c#, I didn’t check edge cases. I’ve checked codes here and all have problems.
When is the point inside or outside a polygon?
If it touches an even number of times, the point is outside the polygon. If it touches an odd number of times, the point is inside. To count the number of times the ray touches, you check intersections between the ray and all of the polygon sides. Converting it to c# / winforms would be trivial.